This is a discussion on Cat delete question!! within the Engine Modifications forums, part of the Tech & Modifying & General Repairs category; Sup guys, so today I went and took off the mid pipe catalytic converter. I have a 2012 wrx hatch. ...

Cat delete question!!

Sup guys, so today I went and took off the mid pipe catalytic converter. I have a 2012 wrx hatch. I know there's one directly behind the turbo and one on the mid pipe. I only took off the mid pipe one. I also have a custom axel back exhaust (magnaflow muffler with custom tips). My question is, with the cat delete should I be running stage 2? I've seen some nice performance gains with the cat delete. Turbo spools way faster and I'm hitting higher boos levels +.5-1.0 I'm currently running the torqued performance stage 1 map with a target boost of 18psi. Car sounds like a beast. Not way loud but a super deep rumble.

Short answer is you are running your car with a modification that your OTS map is not tuned for. Aside from the overboosting issue, you don't really have any idea what your A/F ratio is looking like. Return the exhaust to stock until you can get Eric or someone else to give you a tune appropriate for what you want to do to the car.

- WillFirst Mods: What to do and what not to do
Current Car: 2014 Golf TDI
Previous Cars:2012 WRB WRX Hatch, 2004 RSX-S, 1998 Grand Prix GTP
"Isn't it amazing how smart you feel when you just aren't being stupid?"

Short answer is you are running your car with a modification that your OTS map is not tuned for. Aside from the overboosting issue, you don't really have any idea what your A/F ratio is looking like. Return the exhaust to stock until you can get Eric or someone else to give you a tune appropriate for what you want to do to the car.

+1

Dumb move on your part, subiesnack.

a.) Newer WRXs have a terrible tendency to boost creep to all heck and back without cats... even with a good tune.
b.) WRXs with mismatched OTS tunes (Generic Stage 1 tune with a non stage 1 setup) run like balls and are most likely running lean with poorly matched timing tables... not to mention your boost control tables will be all sorts of messed up.
c.) OTS maps are easy to use. You read the map notes... and you follow them. Something you apparently are incapable of.

Running catless doesn't yield large gains, especially at your power level. "Free flowing exhaust" doesn't mean that all the cats are out of the exhaust... it means its been opened up to 3" from the turbo back... Basically get an aftermarket down pipe.

Originally Posted by Trainrex

He was throwing balloons filled with sulfuric acid and shrapnel at the swat team. They finally had to take him down with rubber bullets.

If you are tuned to run 18 lbs. and are consistently hitting 19+....you should look at adjusting your WDC.

If you are running an off the shelf tune, I would never advise adjusting your WGDC. Those settings are extremely touchy and you could easily cause severe damage. If you know what you are doing in that department, you probably aren't running an OTS tune.

Just talk to your tuner. I don't see what's so wrong with asking for support for a product/service you purchased.

Another thing you might want to look at is your IDC % while making a pull.

He's not maxing out his IDCs. Not a bad thing to check in general, but its a moot point. I'd be more curious to see if he's running at 13AFR at redline.

I'm tuned to 16 lbs. and know I run 85% or just a bit better while making a pull in third. I'm curious to hear what IDC % your hitting at 18 lbs.

-Red

Your IDCs won't increase much with a higher boost pressure at peak torque. IDCs are highest towards red line (peak hp), not peak torque... where the stock turbo isn't gonna move enough air to really cap them out badly... especially with the stock downpipe.

Originally Posted by Trainrex

He was throwing balloons filled with sulfuric acid and shrapnel at the swat team. They finally had to take him down with rubber bullets.

It is a OTS map but was revised a couple times by Eric from torqued performance to match my setup before I took off the cats. What's ill most likely do is run a quick log of a 3rd gear pull and send it to Eric to see what he thinks. The 2 cats are prettyy close together. One is directly behind the turbo and the second is coming right off the bend before the resonator.

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